INT 7F - Alloy NTNX, MW386 - CHANNEL CONTROL - LOCK ALL OPEN CHANNELS AH = 10h CL = 06h Return: AL = status 00h successful 01h busy 02h channel range error (not 00h-3Fh) 03h invalid subfunction Note: may not be invoked from within a hardware interrupt handler SeeAlso: AH=10h/CL=08h